| // Copyright 2019 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package lsp |
| |
| import ( |
| "bytes" |
| "context" |
| "encoding/json" |
| "fmt" |
| "io" |
| "os" |
| "path" |
| "path/filepath" |
| "sync" |
| |
| "golang.org/x/tools/internal/event" |
| "golang.org/x/tools/internal/jsonrpc2" |
| "golang.org/x/tools/internal/lsp/debug" |
| "golang.org/x/tools/internal/lsp/protocol" |
| "golang.org/x/tools/internal/lsp/source" |
| "golang.org/x/tools/internal/span" |
| errors "golang.org/x/xerrors" |
| ) |
| |
| func (s *Server) initialize(ctx context.Context, params *protocol.ParamInitialize) (*protocol.InitializeResult, error) { |
| s.stateMu.Lock() |
| if s.state >= serverInitializing { |
| defer s.stateMu.Unlock() |
| return nil, errors.Errorf("%w: initialize called while server in %v state", jsonrpc2.ErrInvalidRequest, s.state) |
| } |
| s.state = serverInitializing |
| s.stateMu.Unlock() |
| |
| s.clientPID = int(params.ProcessID) |
| s.progress.supportsWorkDoneProgress = params.Capabilities.Window.WorkDoneProgress |
| |
| options := s.session.Options() |
| defer func() { s.session.SetOptions(options) }() |
| |
| if err := s.handleOptionResults(ctx, source.SetOptions(options, params.InitializationOptions)); err != nil { |
| return nil, err |
| } |
| options.ForClientCapabilities(params.Capabilities) |
| |
| folders := params.WorkspaceFolders |
| if len(folders) == 0 { |
| if params.RootURI != "" { |
| folders = []protocol.WorkspaceFolder{{ |
| URI: string(params.RootURI), |
| Name: path.Base(params.RootURI.SpanURI().Filename()), |
| }} |
| } |
| } |
| for _, folder := range folders { |
| uri := span.URIFromURI(folder.URI) |
| if !uri.IsFile() { |
| continue |
| } |
| s.pendingFolders = append(s.pendingFolders, folder) |
| } |
| // gopls only supports URIs with a file:// scheme, so if we have no |
| // workspace folders with a supported scheme, fail to initialize. |
| if len(folders) > 0 && len(s.pendingFolders) == 0 { |
| return nil, fmt.Errorf("unsupported URI schemes: %v (gopls only supports file URIs)", folders) |
| } |
| |
| var codeActionProvider interface{} = true |
| if ca := params.Capabilities.TextDocument.CodeAction; len(ca.CodeActionLiteralSupport.CodeActionKind.ValueSet) > 0 { |
| // If the client has specified CodeActionLiteralSupport, |
| // send the code actions we support. |
| // |
| // Using CodeActionOptions is only valid if codeActionLiteralSupport is set. |
| codeActionProvider = &protocol.CodeActionOptions{ |
| CodeActionKinds: s.getSupportedCodeActions(), |
| } |
| } |
| var renameOpts interface{} = true |
| if r := params.Capabilities.TextDocument.Rename; r.PrepareSupport { |
| renameOpts = protocol.RenameOptions{ |
| PrepareProvider: r.PrepareSupport, |
| } |
| } |
| |
| goplsVersion, err := json.Marshal(debug.VersionInfo()) |
| if err != nil { |
| return nil, err |
| } |
| |
| return &protocol.InitializeResult{ |
| Capabilities: protocol.ServerCapabilities{ |
| CallHierarchyProvider: true, |
| CodeActionProvider: codeActionProvider, |
| CompletionProvider: protocol.CompletionOptions{ |
| TriggerCharacters: []string{"."}, |
| }, |
| DefinitionProvider: true, |
| TypeDefinitionProvider: true, |
| ImplementationProvider: true, |
| DocumentFormattingProvider: true, |
| DocumentSymbolProvider: true, |
| WorkspaceSymbolProvider: true, |
| ExecuteCommandProvider: protocol.ExecuteCommandOptions{ |
| Commands: options.SupportedCommands, |
| }, |
| FoldingRangeProvider: true, |
| HoverProvider: true, |
| DocumentHighlightProvider: true, |
| DocumentLinkProvider: protocol.DocumentLinkOptions{}, |
| ReferencesProvider: true, |
| RenameProvider: renameOpts, |
| SignatureHelpProvider: protocol.SignatureHelpOptions{ |
| TriggerCharacters: []string{"(", ","}, |
| }, |
| TextDocumentSync: &protocol.TextDocumentSyncOptions{ |
| Change: protocol.Incremental, |
| OpenClose: true, |
| Save: protocol.SaveOptions{ |
| IncludeText: false, |
| }, |
| }, |
| Workspace: protocol.Workspace5Gn{ |
| WorkspaceFolders: protocol.WorkspaceFolders4Gn{ |
| Supported: true, |
| ChangeNotifications: "workspace/didChangeWorkspaceFolders", |
| }, |
| }, |
| }, |
| ServerInfo: struct { |
| Name string `json:"name"` |
| Version string `json:"version,omitempty"` |
| }{ |
| Name: "gopls", |
| Version: string(goplsVersion), |
| }, |
| }, nil |
| } |
| |
| func (s *Server) initialized(ctx context.Context, params *protocol.InitializedParams) error { |
| s.stateMu.Lock() |
| if s.state >= serverInitialized { |
| defer s.stateMu.Unlock() |
| return errors.Errorf("%w: initialized called while server in %v state", jsonrpc2.ErrInvalidRequest, s.state) |
| } |
| s.state = serverInitialized |
| s.stateMu.Unlock() |
| |
| for _, not := range s.notifications { |
| s.client.ShowMessage(ctx, not) |
| } |
| s.notifications = nil |
| |
| options := s.session.Options() |
| defer func() { s.session.SetOptions(options) }() |
| |
| if err := s.addFolders(ctx, s.pendingFolders); err != nil { |
| return err |
| } |
| s.pendingFolders = nil |
| |
| if options.ConfigurationSupported && options.DynamicConfigurationSupported { |
| registrations := []protocol.Registration{ |
| { |
| ID: "workspace/didChangeConfiguration", |
| Method: "workspace/didChangeConfiguration", |
| }, |
| { |
| ID: "workspace/didChangeWorkspaceFolders", |
| Method: "workspace/didChangeWorkspaceFolders", |
| }, |
| } |
| if options.SemanticTokens { |
| registrations = append(registrations, semanticTokenRegistration()) |
| } |
| if err := s.client.RegisterCapability(ctx, &protocol.RegistrationParams{ |
| Registrations: registrations, |
| }); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| func (s *Server) addFolders(ctx context.Context, folders []protocol.WorkspaceFolder) error { |
| originalViews := len(s.session.Views()) |
| viewErrors := make(map[span.URI]error) |
| |
| var wg sync.WaitGroup |
| if s.session.Options().VerboseWorkDoneProgress { |
| work := s.progress.start(ctx, DiagnosticWorkTitle(FromInitialWorkspaceLoad), "Calculating diagnostics for initial workspace load...", nil, nil) |
| defer func() { |
| go func() { |
| wg.Wait() |
| work.end("Done.") |
| }() |
| }() |
| } |
| // Only one view gets to have a workspace. |
| assignedWorkspace := false |
| var allFoldersWg sync.WaitGroup |
| for _, folder := range folders { |
| uri := span.URIFromURI(folder.URI) |
| // Ignore non-file URIs. |
| if !uri.IsFile() { |
| continue |
| } |
| work := s.progress.start(ctx, "Setting up workspace", "Loading packages...", nil, nil) |
| var workspaceURI span.URI = "" |
| if !assignedWorkspace && s.clientPID != 0 { |
| // For quick-and-dirty testing, set the temp workspace file to |
| // $TMPDIR/gopls-<client PID>.workspace. |
| // |
| // This has a couple limitations: |
| // + If there are multiple workspace roots, only the first one gets |
| // written to this dir (and the client has no way to know precisely |
| // which one). |
| // + If a single client PID spawns multiple gopls sessions, they will |
| // clobber eachother's temp workspace. |
| wsdir := filepath.Join(os.TempDir(), fmt.Sprintf("gopls-%d.workspace", s.clientPID)) |
| workspaceURI = span.URIFromPath(wsdir) |
| assignedWorkspace = true |
| } |
| snapshot, release, err := s.addView(ctx, folder.Name, uri, workspaceURI) |
| if err != nil { |
| viewErrors[uri] = err |
| work.end(fmt.Sprintf("Error loading packages: %s", err)) |
| continue |
| } |
| var swg sync.WaitGroup |
| swg.Add(1) |
| allFoldersWg.Add(1) |
| go func() { |
| defer swg.Done() |
| defer allFoldersWg.Done() |
| snapshot.AwaitInitialized(ctx) |
| work.end("Finished loading packages.") |
| }() |
| |
| // Print each view's environment. |
| buf := &bytes.Buffer{} |
| if err := snapshot.WriteEnv(ctx, buf); err != nil { |
| viewErrors[uri] = err |
| continue |
| } |
| event.Log(ctx, buf.String()) |
| |
| // Diagnose the newly created view. |
| wg.Add(1) |
| go func() { |
| s.diagnoseDetached(snapshot) |
| swg.Wait() |
| release() |
| wg.Done() |
| }() |
| } |
| |
| // Register for file watching notifications, if they are supported. |
| // Wait for all snapshots to be initialized first, since all files might |
| // not yet be known to the snapshots. |
| allFoldersWg.Wait() |
| if err := s.updateWatchedDirectories(ctx); err != nil { |
| event.Error(ctx, "failed to register for file watching notifications", err) |
| } |
| |
| if len(viewErrors) > 0 { |
| errMsg := fmt.Sprintf("Error loading workspace folders (expected %v, got %v)\n", len(folders), len(s.session.Views())-originalViews) |
| for uri, err := range viewErrors { |
| errMsg += fmt.Sprintf("failed to load view for %s: %v\n", uri, err) |
| } |
| return s.client.ShowMessage(ctx, &protocol.ShowMessageParams{ |
| Type: protocol.Error, |
| Message: errMsg, |
| }) |
| } |
| return nil |
| } |
| |
| // updateWatchedDirectories compares the current set of directories to watch |
| // with the previously registered set of directories. If the set of directories |
| // has changed, we unregister and re-register for file watching notifications. |
| // updatedSnapshots is the set of snapshots that have been updated. |
| func (s *Server) updateWatchedDirectories(ctx context.Context) error { |
| patterns := s.session.FileWatchingGlobPatterns(ctx) |
| |
| s.watchedGlobPatternsMu.Lock() |
| defer s.watchedGlobPatternsMu.Unlock() |
| |
| // Nothing to do if the set of workspace directories is unchanged. |
| if equalURISet(s.watchedGlobPatterns, patterns) { |
| return nil |
| } |
| |
| // If the set of directories to watch has changed, register the updates and |
| // unregister the previously watched directories. This ordering avoids a |
| // period where no files are being watched. Still, if a user makes on-disk |
| // changes before these updates are complete, we may miss them for the new |
| // directories. |
| prevID := s.watchRegistrationCount - 1 |
| if err := s.registerWatchedDirectoriesLocked(ctx, patterns); err != nil { |
| return err |
| } |
| if prevID >= 0 { |
| return s.client.UnregisterCapability(ctx, &protocol.UnregistrationParams{ |
| Unregisterations: []protocol.Unregistration{{ |
| ID: watchedFilesCapabilityID(prevID), |
| Method: "workspace/didChangeWatchedFiles", |
| }}, |
| }) |
| } |
| return nil |
| } |
| |
| func watchedFilesCapabilityID(id int) string { |
| return fmt.Sprintf("workspace/didChangeWatchedFiles-%d", id) |
| } |
| |
| func equalURISet(m1, m2 map[string]struct{}) bool { |
| if len(m1) != len(m2) { |
| return false |
| } |
| for k := range m1 { |
| _, ok := m2[k] |
| if !ok { |
| return false |
| } |
| } |
| return true |
| } |
| |
| // registerWatchedDirectoriesLocked sends the workspace/didChangeWatchedFiles |
| // registrations to the client and updates s.watchedDirectories. |
| func (s *Server) registerWatchedDirectoriesLocked(ctx context.Context, patterns map[string]struct{}) error { |
| if !s.session.Options().DynamicWatchedFilesSupported { |
| return nil |
| } |
| for k := range s.watchedGlobPatterns { |
| delete(s.watchedGlobPatterns, k) |
| } |
| var watchers []protocol.FileSystemWatcher |
| for pattern := range patterns { |
| watchers = append(watchers, protocol.FileSystemWatcher{ |
| GlobPattern: pattern, |
| Kind: uint32(protocol.WatchChange + protocol.WatchDelete + protocol.WatchCreate), |
| }) |
| } |
| |
| if err := s.client.RegisterCapability(ctx, &protocol.RegistrationParams{ |
| Registrations: []protocol.Registration{{ |
| ID: watchedFilesCapabilityID(s.watchRegistrationCount), |
| Method: "workspace/didChangeWatchedFiles", |
| RegisterOptions: protocol.DidChangeWatchedFilesRegistrationOptions{ |
| Watchers: watchers, |
| }, |
| }}, |
| }); err != nil { |
| return err |
| } |
| s.watchRegistrationCount++ |
| |
| for k, v := range patterns { |
| s.watchedGlobPatterns[k] = v |
| } |
| return nil |
| } |
| |
| func (s *Server) fetchConfig(ctx context.Context, name string, folder span.URI, o *source.Options) error { |
| if !s.session.Options().ConfigurationSupported { |
| return nil |
| } |
| configs, err := s.client.Configuration(ctx, &protocol.ParamConfiguration{ |
| ConfigurationParams: protocol.ConfigurationParams{ |
| Items: []protocol.ConfigurationItem{{ |
| ScopeURI: string(folder), |
| Section: "gopls", |
| }}, |
| }, |
| }) |
| if err != nil { |
| return fmt.Errorf("failed to get workspace configuration from client (%s): %v", folder, err) |
| } |
| for _, config := range configs { |
| if err := s.handleOptionResults(ctx, source.SetOptions(o, config)); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| func (s *Server) eventuallyShowMessage(ctx context.Context, msg *protocol.ShowMessageParams) error { |
| s.stateMu.Lock() |
| defer s.stateMu.Unlock() |
| if s.state == serverInitialized { |
| return s.client.ShowMessage(ctx, msg) |
| } |
| s.notifications = append(s.notifications, msg) |
| return nil |
| } |
| |
| func (s *Server) handleOptionResults(ctx context.Context, results source.OptionResults) error { |
| for _, result := range results { |
| if result.Error != nil { |
| msg := &protocol.ShowMessageParams{ |
| Type: protocol.Error, |
| Message: result.Error.Error(), |
| } |
| if err := s.eventuallyShowMessage(ctx, msg); err != nil { |
| return err |
| } |
| } |
| switch result.State { |
| case source.OptionUnexpected: |
| msg := &protocol.ShowMessageParams{ |
| Type: protocol.Error, |
| Message: fmt.Sprintf("unexpected gopls setting %q", result.Name), |
| } |
| if err := s.eventuallyShowMessage(ctx, msg); err != nil { |
| return err |
| } |
| case source.OptionDeprecated: |
| msg := fmt.Sprintf("gopls setting %q is deprecated", result.Name) |
| if result.Replacement != "" { |
| msg = fmt.Sprintf("%s, use %q instead", msg, result.Replacement) |
| } |
| if err := s.eventuallyShowMessage(ctx, &protocol.ShowMessageParams{ |
| Type: protocol.Warning, |
| Message: msg, |
| }); err != nil { |
| return err |
| } |
| } |
| } |
| return nil |
| } |
| |
| // beginFileRequest checks preconditions for a file-oriented request and routes |
| // it to a snapshot. |
| // We don't want to return errors for benign conditions like wrong file type, |
| // so callers should do if !ok { return err } rather than if err != nil. |
| func (s *Server) beginFileRequest(ctx context.Context, pURI protocol.DocumentURI, expectKind source.FileKind) (source.Snapshot, source.VersionedFileHandle, bool, func(), error) { |
| uri := pURI.SpanURI() |
| if !uri.IsFile() { |
| // Not a file URI. Stop processing the request, but don't return an error. |
| return nil, nil, false, func() {}, nil |
| } |
| view, err := s.session.ViewOf(uri) |
| if err != nil { |
| return nil, nil, false, func() {}, err |
| } |
| snapshot, release := view.Snapshot(ctx) |
| fh, err := snapshot.GetVersionedFile(ctx, uri) |
| if err != nil { |
| release() |
| return nil, nil, false, func() {}, err |
| } |
| if expectKind != source.UnknownKind && fh.Kind() != expectKind { |
| // Wrong kind of file. Nothing to do. |
| release() |
| return nil, nil, false, func() {}, nil |
| } |
| return snapshot, fh, true, release, nil |
| } |
| |
| func (s *Server) shutdown(ctx context.Context) error { |
| s.stateMu.Lock() |
| defer s.stateMu.Unlock() |
| if s.state < serverInitialized { |
| event.Log(ctx, "server shutdown without initialization") |
| } |
| if s.state != serverShutDown { |
| // drop all the active views |
| s.session.Shutdown(ctx) |
| s.state = serverShutDown |
| } |
| return nil |
| } |
| |
| func (s *Server) exit(ctx context.Context) error { |
| s.stateMu.Lock() |
| defer s.stateMu.Unlock() |
| |
| // TODO: We need a better way to find the conn close method. |
| s.client.(io.Closer).Close() |
| |
| if s.state != serverShutDown { |
| // TODO: We should be able to do better than this. |
| os.Exit(1) |
| } |
| // we don't terminate the process on a normal exit, we just allow it to |
| // close naturally if needed after the connection is closed. |
| return nil |
| } |